They have fiber-optics adaptors. I just had basic audio, so can only talk about that, but the sound actually became 100 times better. I kinda suspected what crap the basic setup was, but it was much worse than I thought That Erisin somehow improved the sound beyond believe

 

"Fiber optic adapters" sounds like they simply convert the fiber optic input to an analog output. If that's the case, you're not getting the sound quality a full fiber optic output would provide.

 

Maybe it’s just me, but I feel more comfortable going with a brand name aftermarket audio manufacturer like Alpine that’s been around for decades and has lots of end user testing to ensure it will “do no harm.”

 

I certainly understand that. But in modern world those old-world brands often are too slow to react to changes. Those alpine units look a bit outdated IMO, and that empty panel real estate, gives away that it's not stock for AR person like me. And, most of all, I firm believer that volume should be regulated by physical ****. Not any kind of buttons. Buttons for volume is a show stopper for me.

I felt like it's well worth experimenting at 300 bucks and good reviews, and in the end extremely happy with the results. I no longer feel like driving a 20 year old car, while it still looks more or less stock:

 

2nd all of this, hence I steered clear of all the mainstream after market units. There are nice Kenwood ones with *****. I think the CHTek one looks the best and mine arrives today!